In a molecule of calcium sulfide, calcium has two valence electron bonds, and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium sulfide?
A.
one
B.
two
C.
three
D.
four
E.
none

Question

In a molecule of calcium sulfide, calcium has two valence electron bonds, and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium sulfide?
A. 
one
B. 
two
C. 
three
D. 
four
E. 
none

minustempo · Answer

It should be two lone pairs.
The sulfur takes two electrons from the calcium and pairs them with 2 of its own, I believe.
So sulfur has 4 other electrons, or 2 lone pairs.

hunter3506 · Answer

The answer is D which is four  Ca has given up 2 electrons to sulfur with six which makes 8 e-, or 4 pairs